请参考String#hex,String#oct,String#to_i. String(arg) 1. 调用arg.to_s将参数变为字符串并返回结果。若变换后的结果并非字符串的话,会引发TypeError异常。若arg已经是字符串的话,则不作任何处理直接返回arg。 abort abort(message) ((<ruby 1.7 特性>)) 1. 2. 3. 4. 以非正常方式结束Ruby程序的运行。
The []= operator allows you to alter the characters of a string or to insert, delete, and replace substrings. The << operator allows you to append to a string, and the String class defines various other methods that alter strings in place. Because strings are mutable, string literals in ...
添加了#append和#prepend方法, 分别是#push和#unshift的别名。 这些别名已通过ActiveSupport在Rails中引入, 但是很高兴看到它们被引入Ruby。 list = ['b', 'c'] #=> ['b', 'c'] list.prepend('a') #=> ['a', 'b', 'c'] list.append('d') #=> ['a', 'b', 'c', 'd'] list #=> ...
And my toast has gone to the moon. My honeydew has flown from my hand Success! > Thejoinmethod took that list of reversed lines and put them together into a string. (Sure, you could have also just usedto_s.) String字符串函数参考:http://ruby-doc.org/core-2.1.2/String.html 5.4Hash...
28. .to_i, .to_f, .to_s 用来转换成integer, float, string。 29. 操作符 << 用来append 字符串。 第八章 作用域 作用域指的是变量的生命空间或者说作用范围 。不同类型的变量有不同的作用域。本章主 要讲两种,全局变量(Global)和局部变量(Local)。 全局作用域和全局变量 全局作用域指的是...
But when an array is multiplied by a string, the result is the same as calling the join method of the array and passing that string as the argument. Shift and Append: << and >> The Fixnum and Bignum classes define the << and >> operators to shift the bits of the lefthand argument...
-> "13" irb> nil.to_s ---> "" # to_s 如此之棒的原因在于 String#to_s 方法只是简单返回 self 而不做任何转换和复制 # 如果一个变量是 string,那么调用 to_s 的开销最小 # 但如果变量期待 string 而恰好得到 nil,to_s 也能帮你扭转局面: def fix_title (title) title.to_s.capitalize end...
String.new(str = "") Example =beginRuby program to demonstrate String generation=endputs"String.new(str) method implementation"String.new(str="Hello there! You are at includehelp.com")puts"The string object generated is:#{str}" Output ...
string["text"] Use non-capturing groups when you don't use the captured result. # bad /(first|second)/ # good /(?:first|second)/ Prefer Regexp#match over Perl-legacy variables to capture group matches. # bad /(regexp)/ =~ string process $1 # good /(regexp)/.match(string)[1]...
This feature helps loading debug.gem with RUBYOPT='-r debug/...', and you don't want to derive it to child processes. In this case, you can set RUBY_DEBUG_ADDED_RUBYOPT='-r debug/...' (same value), and this string will be deleted from RUBYOPT at first. RUBY_DEBUG_EDITOR or...